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Catalytic performance of Fe modified K/Mo_2C catalyst for CO hydrogenation

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Journal of Natural Gas Chemistry 2011年第5期20卷 520-524页

作者： Minglin Xiang Dudu Wu juan zou Debao Li Yuhan Sun Xichun She Hunan Changling Petrochemical S＆T Developing Co. Ltd. Yueyang 414012 Hunan China School of Pharmacy Guangdong Medical College Dongguan 523808 Guangdong China State Key Laboratory of Coal Conversion Shanxi Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 Shanxi China

Fe modified and un-modified K/Mo2C were prepared and investigated as catalysts for CO hydrogenation reaction. Compared with K/Mo2C catalyst, the addition of Fe increased the production of alcohols, especially the C2＋OH. Meanwhile, considerable amounts of C5＋ hydrocar- bons and C2= -C4= were formed, whereas methane selectivity greatly decreased. Also, the activity and selectivity of the catalyst were readily affected by the reaction pressure and temperature employed. According to the XPS results, Mo4＋ might be responsible for the production of alcohols, whereas the low valence state of Mo species such as Mo^0 and/or Mo^2＋ might be account for the high activity and selectivity toward hydrocarbons.

关键词： K/Mo2C Fe promoter CO hydrogenation

Pro-osteogenesis and in vivo tracking investigation of a dental implantation system comprising novel mTi implant and HYH-Fe particles

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Bioactive Materials 2021年第9期6卷 2658-2666页

作者： Xiyu Li juan Wu Danxue Li Qin zou Yi Man Ling zou Wei Li State Key Laboratory of Oral Diseases&National Clinical Research Center for Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu610041China Analytical and Testing Center Sichuan UniversityChengdu610064China

Insufficient early osteogenesis seriously affects the later stage osteogenic quality and osseointegration of dental *** promote early osteogenesis,we first designed a Ti dental implant with a built-in magnet(mTi)to produce a local static magnetic field(SMF).Then,a dental implantation system comprising the mTi implant and the superparamagnetic hydroxyapatite(HA:Yb/Ho-Fe,named HYH-Fe)particles was implanted into the alveolar bone of *** results showed that the mTi+HYH-Fe group displayed better early osteogenesis and later stage osseointegration than the Ti+HA and mTi+HA groups.A combination of the local SMF(mTi)and superparamagnetic HYH-Fe particles had a positive effect on the pro-osteogenesis of Ti *** results also indicated that week 10 could be adopted as the key time point to evaluate the early osteogenic effect of the mTi+HYH-Fe implantation system,which would be a promising prospect for promotion of osteogenesis,in vivo tracking investigation of material-bone relationships,and clinical applications.

关键词： Pro-osteogenesis mTi implant Local static magnetic field Superparamagnetic particles In vivo tracking

Regional Evaluation of Winter Rapeseed Response to K Fertilization, K Use Efficiency, and Critical Level of Soil K in the Yangtze River Valley

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Agricultural Sciences in China 2011年第6期10卷 911-920页

作者： zou juan LU Jian-wei LI Yin-shui LI Xiao-kun College of Resources and Environment Huazhong Agricultural University Wuhan 430070 P.R. China

The investigation was carried out to study the response of winter rapeseed to potassium （K） feritlization and the critical soil available K level for current winter rapeseed production in the Yangtze River Valley （YRV） of China. A total of 132 field experiments were conducted in fields of farmers in the major winter rapeseed growing areas in YRV in 2000/2001 and 2004/2005 to 2006/2007 during growing season. Results of these field experiments showed that the average rapeseed yield increment resulting from 100 kg K ha-1 application was 358 kg ha-1, an increase over the control CK （no K） of 18.0% in 2005/2006 and 2006/2007. The average internal use efficiency （IE） of K was higher in the CK treatment （21.9 kg grain, kg-1 K uptake） than in the ＋K （100 kg K ha-1） treatment （17.7 kg grain, kg-1 K uptake）. Winter rapeseed required 68.1 kg of K to produce 1 000 kg seed. The recovery efficiency of K fertilizer in rapeseed production averaged 39.3%. The K balance was negative, with an average net removal of 117.6 kg K ha-1 in the CK treatment annually, and 56.8 kg K ha-1 in the ＋K treatment. The results indicated that there was a significant negative relationship between yield increments by K application and soil available K content. Based on the relative yield of CK/＋K at 90% level, the critical level of soil available K （NH4OAc-extractable K） was 135 mg kg-1.

关键词： rapeseed (Brassica napus L.) K fertilizer K use efficiency yield critical level of soil available K

A unified model for determining fracture strain of metal films on flexible substrates

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Journal of Materials Science & Technology 2020年第19期54卷 87-94页

作者： Xu-Ping Wu Xue-mei Luo Hong-Lei Chen Ji-Peng zou Guang-Ping Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of Chin1Shenyang 110016China

Failure strain determination of polymer-supported thin films is a key for the design of the flexible devices.A theoretical model R/R0=(L/L0)2(R,L are the electrical resistance and the length of the stretched film,respectively.R0,L0 are the corresponding initial values.)has been widely used to determine the fracture strain of thin films on flexible ***,this equation loses its function in some special ***,a simple and universal theoretical model was proposed to determine the fracture strain of metal thin films on flexible substrates in more generally *** this model,we investigated the thicknessdependent failure strains of Cu-5 at.%Al films with thickness of 10 nm,200 nm,1000 nm,and Ti films with thickness of 50 nm,100 nm,300 *** model was also employed to study the published data *** results showed that the new model provided a fairly good prediction of the failure strains of different films.

关键词： Thin films Fracture Electrical resistance Microstructure Flexible substrate

Transcriptional response of Microcystis aeruginosa to the recruitment promoting-benthic bacteria

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Journal of Oceanology and Limnology 2022年第1期40卷 153-162页

作者： juan WANG Yuande PENG Zhi WANG Wansheng zou Xianjin PENG Qisheng SONG College of Life Sciences Hunan Normal UniversityChangsha 410081China Institute of Bast Fiber Crops Chinese Academy of Agricultural SciencesChangsha 410205China Department of Life Science Hunan University of Arts and ScienceChangde 415000China Division of Plant Sciences University of MissouriColumbia 65211MOUSA

Blooms of Microcystis aeruginosa occur frequently in many freshwater ecosystems around the world,but the mechanism of recovery has not been fully *** our previous study,three benthic bacterial species(***013,***06,and ***24)were identifi ed capable of promoting the recruitment of ***,we further investigated the transcriptional response of *** to the benthic bacteria in early phase of recruitment by means of RNA-Seq *** total,5803803 unigenes on average length of 404 bp were obtained from the transcriptome of *** were 54982 unigenes identifi ed as benthic bacteria-responsive unigenes based on the expression level *** of the protein-protein interaction analysis(PPI)show that the hub genes of the benthic bacteria responsive unigenes mediated network were ribosomal proteins of 30S and 50S,and the most signifi cant functional module of the network was related to the *** the unigenes encoding the translation initiation factors(IF-2,IF-3)and elongation factors(lepA,fusA,and tufA)were up-regulated to respond benthic ***,it indicates that the benthic bacteria have a positive infl uence on activating the ribosome during the early recovery stage of ***.

关键词： Microcystis aeruginosa ribosome benthic bacteria chlorophyll a

Precautionary Effort Investment under Cross Risk Aversion

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Journal of Systems Science and Information 2019年第4期10卷 344-358页

作者： Yuqing TAO Jie mei Wen CHENG Sijie zou Department of Teacher Education Maanshan Teacher’s CollegeMa’anshan 243041China Class 6 Grade 1No.1 Middle School Affiliated to Central China Normal UniversityWuhan 430223China Department of Risk Management China Huarong Asset Management Co.LtdBeijing 100033China Department of Finance Shandong BranchChina Three Gorges New Energy Co.LtdJinan 277000China

This paper deals with the effort problem under multiple risks in bivariate utility setting. We identify preference conditions to insure positive or negative effect of a background variable uncertainty on effort in the presence of other risks. We allow for the simultaneous presence of wealth and background variable uncertainties. We investigate the joint effect of two-source uncertainties on effort when two risks are either small or positive quadrant dependent. Our work extends the previous model of effort to bivariate utility framework and presents new insights into the issue of optimal effort under uncertainty.

关键词： precautionary effort risks correlation risk aversion cross prudence decision-making under uncertainty

Does Biochar Addition Influence the Change Points of Soil Phosphorus Leaching?

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Journal of Integrative Agriculture 2014年第3期13卷 499-506页

作者： ZHAO Xiao-rong LI Dan KONG juan LIN Qi-mei College of Resource and Environmental Sciences China Agricultural University

Phosphorus change point indicating the threshold related to P leaching, largely depends on soil properties. Increasing data have shown that biochar addition can improve soil retention capacity of ions. However, we have known little about weather biochar amendment influence the change point of P leaching. In this study, two soils added with 0, 5, 10, 20, and 50 g biochar kg-1 were incubated at 25℃ for 14 d following adjusting the soil moisture to 50% water-holding capacity （WHC）. The soils with different available P values were then obtained by adding a series of KH2PO4 solution （ranging from 0 to 600 mg P kg-1 soil）, and subjecting to three cycles of drying and rewetting. The results showed that biochar addition significantly lifted the P change points in the tested soils, together with changes in soil pH, organic C, Olen-P and CaC12-P but little on exchangeable Ca and Mg, oxalate-extractable Fe and Al. The Olsen-P at the change points ranged from 48.65 to 185.07 mg kg-1 in the alluvial soil and 71.25 to 98.65 mg kg^-1 in the red soil, corresponding to CaCl2-P of 0.31-6.49 and 0.18-0.45 mg L~, respectively. The change points of the alluvial soil were readily changed by adding biochar compared with that of the red soil. The enhancement of change points was likely to be explained as the improvement of phosphate retention ability in the biochar-added soils.

关键词： biochar soil phosphorus change point

Lanthanum promoting bone formation by regulating osteogenesis,osteoclastogenesis and angiogenesis

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Journal of Rare Earths 2024年第3期42卷 621-628,I0007页

作者： Dandan zou Runlian Lin Yu Han juan Jia Guoqiang Zhou Haisong Zhang Kun Ge Hebei Key Laboratory of Chronic Kidney Diseases and Bone Metabolism Affiliated Hospital of Hebei UniversityBaoding071000China Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of Education Key Laboratory of Chemical Biology of Hebei ProvinceCollege of Chemistry and Environmental ScienceHebei UniversityBaoding071002China

With lanthanum(La) in agriculture, medicine, and the chemical industry, La shows accumulation in the body, especially in the bone, because of its similar structure to calcium. Moreover, La has a direct role in bone formation regulating osteoblasts and osteoclasts. Nevertheless, bone formation is complex under the regulation of osteogenesis, osteoclastogenesis, and angiogenesis in the bone microenvironment. It is difficult to comprehensively understand the regulation of bone homeostasis from a single kind of ***, some bone microenvironment-related cells and mouse calvaria culture models were used to study the regulatory effect of La-based compound-lanthanum nitrate(La(NO_(3))_(3)) on bone ***(NO_(3))_(3) has good biological safety, and the osteogenic differentiation is significantly increased under La(NO_(3))_(3) treatment for bone marrow mesenchymal stem cells(BMMSC). In contrast, the differentiation,maturation, and bone erosion ability of osteoclasts are significantly decreased. Meanwhile, the angiogenesis ability of human umbilical vein endothelial cells(HUVEC) is significantly promoted when treated with La(NO_(3))_(3). Furthermore, bone metabolism and angiogenesis are improved under La(NO_(3))_(3) treatment in the calvaria ex vivo culture model and BMMSC-HUVEC co-culture system. These results suggest that La has the beneficial effect of promoting bone metabolism and improving bone formation in the bone microenvironment.

关键词： Lanthanum Bone microenvironment Osteogenic differentiation Angiogenesis Rare earths

Conformational Transitions and Self-assembly of Regenerated Spider Silk Protein in Water

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Journal of Donghua University(English Edition) 2014年第5期31卷 668-674页

作者： ZHANG Ye-mei WANG Zhe PAN Zhi-juan College of Textile and Clothing Engineering Soochow University Suzhou 21502i Ctffna" National Engineering Laboratory for Modern Silk Soochow University Suzhou 215123 China

Spider silk, relying on its exceptional mechanical properties, has attracted extensive attention throughout the world. The structure of a material can influence its mechanical properties. Investigation of the structure of spider silk includes amino acid composition, molecular structure, self-assembly, and crystallization, among other characteristics. Herein, the effects of concentration, time, alkali metal ions （Na^＋and K ^＋） and pH on the conformational transition and self-assembly of regenerated Ornithoctonus huwena spider dragline silk protein （spidroin） in water were investigated using circular dichroism （CD） and atomic force microScopy （AFM）. Spidroin concentration, time and Na ＋ ions slightly influenced the conformational transition of spidroin molecules. However, K ＋ ions and pH induced the formation of a β- sheet structure. Increasing spidroin concentration or time increased the aggregation of spidroin and enhanced the formation of nanoffiaments. K ~ ions enhanced the serf-assembly of spidroin into nanofilaments. The self-assembled nanofilaments appeared at a pH of approximately 6. 11. Both lower and higher pH induced aggregation. At a lower pH, the aggregation was composed of nanopartides, whereas higher pH induced the aggregation of nanoffiaments, likely from the synergistic effect of Na ^＋ ions and pH.

关键词： regenerated spider silk conformational transition self-assembly